CN109055850A - Improve the preparation method of cold work die steel eutectic carbide - Google Patents

Improve the preparation method of cold work die steel eutectic carbide Download PDF

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Publication number
CN109055850A
CN109055850A CN201811001267.7A CN201811001267A CN109055850A CN 109055850 A CN109055850 A CN 109055850A CN 201811001267 A CN201811001267 A CN 201811001267A CN 109055850 A CN109055850 A CN 109055850A
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steel
temperature
steel ingot
rolling
cold work
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杜思敏
吴铖川
林发驹
涂露寒
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Chengdu Advanced Metal Materials Industry Technology Research Institute Co Ltd
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Chengdu Advanced Metal Materials Industry Technology Research Institute Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D7/00Modifying the physical properties of iron or steel by deformation
    • C21D7/13Modifying the physical properties of iron or steel by deformation by hot working
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24Ferrous alloys, e.g. steel alloys containing chromium with vanadium

Abstract

The present invention relates to the preparation methods for improving cold work die steel eutectic carbide, belong to technical field of ferrous metallurgy.Present invention solves the technical problem that being the mechanical properties decrease that the uneven distribution of bulky grain eutectic carbide and eutectic carbide present in cold work die steel leads to steel, and occur deformation, cracking and other issues during heat treatment.The technical solution of the present invention is to provide the preparation methods for improving cold work die steel eutectic carbide, and step includes smelting, homogenize process and the forging or rolling of steel, mainly control different temperatures section deflection in forging or the operation of rolling.The present invention is suitable for the cold work die steel that thickness range is 70~200mm and prepares, the irregularity of eutectic carbides is assessed as≤4 grades by the 4th judge picture in GB/T14979 standard, qualified rank is determined that final product quality grade meets B/b grades, A/a grades by GB/T1299-2014.

Description

Improve the preparation method of cold work die steel eutectic carbide
Technical field
The invention belongs to technical field of ferrous metallurgy, and in particular to improve the preparation side of cold work die steel eutectic carbide Method, cold work die steel thickness range are 70~200mm.
Background technique
Mould steel is the steel grade for manufacturing the molds such as cold-punching mould, hot-forging die, compression mod, and wherein cold work die steel is to instigate Metal deforms in the cold state or shapes used mould steel.Most widely used cold working die steel material is main currently on the market For Cr12, Crl2MoV etc. of high carbon and chromium, due to harden ability with higher, hardenability, wearability, and high-temperature oxidation resistant Performance is good, is widely used in manufacturing cold-working mold for various purposes as universal cold working die steel material, such as shape is answered Miscellaneous punching concave die, cold extruding die, roll threading wheel, cold shears cutter and fine measuring instrument etc..However, high carbon and chromium cold work die steel category It, can shape in solidification and During Eutectoid Decomposition due to containing the carbide formers such as a large amount of Cr, Mo, V in steel in ledeburite steel At a large amount of eutectic carbides, cause the thermoplasticity of steel poor, is easy to appear face crack forging or rolling in process.And And although forged or rolling deformation process can be crushed herring-bone form eutectic carbide, forged or the shadow of rolling direction It rings, the distribution of carbides in steel is still non-uniform, and large particle carbide present in steel or distribution of carbides are uneven It is even seriously to reduce the mechanical property of steel, and mold is caused to occur deformation, cracking and other issues during heat treatment.Cause This, the irregularity of eutectic carbides is the weight for measuring the high carbon and chromiums cold work die steel material Quality level of actual product such as Cr12, Crl2MoV Want technical indicator.
Summary of the invention
Present invention solves the technical problem that being bulky grain eutectic carbide present in cold work die steel and eutectic carbonization The uneven distribution of object leads to the mechanical properties decrease of steel, and occurs deformation, cracking and other issues during heat treatment.
The present invention provides the preparation method for improving cold work die steel eutectic carbide, smelting, homogenize process including steel With forging or rolling, the specific steps are as follows:
A, the smelting of steel uses electric furnace smelting+LF refining+VD vacuum refining, and chemical component is calculated in mass percent control and is C:1.45~1.70, Cr:11.00~12.50, Mo:0.40~0.60, V:0.15~0.30;
B, at 1130 DEG C ± 10 DEG C, soaking time is controlled in 8h or more the heating and temperature control of homogenize process;
C, the steel ingot obtained through step b homogenize process is forged or is rolled, forging process uses " a two light weights " Direct drawing out moulding process, the operation of rolling is that progress reversible rolling is transported on milling train after steel ingot is come out of the stove.
Wherein, it is C:1.45~1.57, Cr:11.00~11.75, Mo:0.40 that chemical component, which is calculated in mass percent control, ~0.50, V:0.15~0.22.
Wherein, homogenize process send steel ingot into soaking pit to be red, makes steel ingot under 600 ± 10 DEG C of furnace temperature first Heat preservation, is then heated to 850 ± 10 DEG C of heat preservations, is heated to 1130 ± 10 DEG C and is kept the temperature.
Further, homogenize process send steel ingot into soaking pit to be red, and its temperature is measured before steel ingot puts soaking pit into T, heating temperature and soaking time is spent to carry out according to following situations,
If 600 DEG C of 400 DEG C≤T <, makes steel ingot keep 1h under 600 ± 10 DEG C of furnace temperature first, then with≤ The heating rate of 100 DEG C/h by Heating Steel Ingots to 850 ± 10 DEG C, make steel ingot kept under 850 ± 10 DEG C of furnace temperature 3h with On, then with the heating rate of≤150 DEG C/h by Heating Steel Ingots to 1130 ± 10 DEG C, make furnace temperature item of the steel ingot at 1130 ± 10 DEG C 8h or more is kept under part, total time of the steel ingot in soaking pit is 18~20h;
If 400 DEG C of T <, steel ingot is made to keep 5h under 600 ± 10 DEG C of furnace temperature first, then with≤100 DEG C/h Heating rate by Heating Steel Ingots to 850 ± 10 DEG C, so that steel ingot is kept 3h or more under 850 ± 10 DEG C of furnace temperature, secondly Protect steel ingot under 1130 ± 10 DEG C of furnace temperature to 1130 ± 10 DEG C Heating Steel Ingots with the heating rate of≤150 DEG C/h Hold 8h or more, total time of the steel ingot in soaking pit be 22~for 24 hours;
Wherein, forging or the operation of rolling are in different temperatures range restraint different distortion amount.
Wherein, forging process is using wide flat anvil forging up and down, and forging process according to different temperatures range restraint not Same pass deformation, when temperature is at 1070 DEG C or more, pass deformation is controlled between 5%~10%;When temperature is 1070 DEG C~900 DEG C between when, pass deformation control between 20%~35%;When temperature is at 900 DEG C or less, pass deformation Between 3%~5%, final forging temperature is not less than 860 DEG C for control.
The mould steel of the steel such as Cr12, Crl2MoV system is easy to appear forging burning, is on the one hand since hard carbide makes For fuel factor when forging than more significant, temperature rise phenomenon is obvious, be on the other hand because eutectic carbide heap at fusing point compared with Low reason.Forging temperature hammered in the upper limit it is too quickly, forging temperature rise workpiece temperature can be made to rise to eutectic melting temperature, occur Burn-off phenomenon is forged, blank is in the fragmentation of bean curd slag specimen under hammering, forms Lai Shi in crystal boundary after the liquid phase that when high temperature occurs is cooling Volume grid.Weight only could be used in the intermediate temperature area of forging and it is necessary to be thumped, bang, which can not only break up, smashes carbonization Object heaps, and slab temperature can be inhibited to decline.But it is gently forged again when reaching forging temperature lower limit area, because of low temperature workpiece Plasticity is poor, and forging can be by mold base forge crack again.The forging technology of this " light-weight-is light " is exactly " two in ledeburite steel forging technology A light weight " forging method.
Wherein, the operation of rolling carries out the rolling of six passage reversibles, and the control of the first passage rolling temperature is at 1070 DEG C or more, steel Ingot deforms reduction ratio control between 10%~15%, and pony-roughing pass (the 2nd 345 passage) rolling temperature is controlled at 1070 DEG C Between~970 DEG C, steel ingot total deformation reduction ratio controls final pass (the 6th passage) rolling temperature control between 20%~30% For system between 970 DEG C~900 DEG C, steel ingot deforms reduction ratio control between 3%~5%.
Wherein, the biting speed in the first hole of the operation of rolling is 15~25r/min, and the biting speed of finished hole is not more than 10r/ min。
Wherein, steel ingot before rolling, checks that steel ingot whether there is male and female face or black root, and if it exists, then again by steel ingot It puts into soaking pit, and keeps 1h or more under 1130 ± 10 DEG C of furnace temperature, then come out of the stove.
Wherein, milling train is reversible mill, thereon roller diameter be 760~870mm, bottom roll diameter be 770~ 880mm。
Beneficial effects of the present invention:
The present invention does not occur implosion and surface crack defect in forging or the operation of rolling, is prepared through the invention Cr12MoV cold work die steel (thickness 70mm~200mm) forging material or stocking eutectic carbide are sufficiently crushed, and are uniformly distributed, altogether Brilliant Carbide Nonuniformity is assessed as≤4 grades by the 4th judge picture in GB/T14979 standard, and finished product is visited by GB/T6402 ultrasonic wave Wound, qualified rank determine that credit rating meets B/b grades, A/a grades, thus the present invention significantly improves by GB/T1299-2014 Cr12MoV cold work die steel lumber recovery, reduces production cost.
Specific embodiment
The present invention provides the preparation method for improving cold work die steel eutectic carbide, smelting, homogenize process including steel With forging or rolling, the specific steps are as follows:
A, the smelting of steel uses electric furnace smelting+LF refining+VD vacuum refining, and chemical component is calculated in mass percent control and is C:1.45~1.70, Cr:11.00~12.50, Mo:0.40~0.60, V:0.15~0.30;
B, the heating and temperature control of homogenize process is carried out at 1130 DEG C ± 10 DEG C, and soaking time is controlled in 8h or more;
C, the steel ingot obtained through step b homogenize process is forged or is rolled, forging process uses " a two light weights " Direct drawing out moulding process, roll and be transported on milling train after coming out of the stove for steel ingot, be carried out continuously at least six passage reversibles rolling.
Wherein, it is C:1.45~1.57, Cr:11.00~11.75, Mo:0.40 that chemical component, which is calculated in mass percent control, ~0.50, V:0.15~0.22.Step a chemical component C, Cr, Mo, V press lower limit control, on the basis for guaranteeing material property On, by the control to the carbides content such as C, Cr, Mo, V in steel, effectively control the content of carbide in steel.
Wherein, homogenize process send steel ingot into soaking pit to be red, makes steel ingot under 600 ± 10 DEG C of furnace temperature first Heat preservation, is then heated to 850 ± 10 DEG C of heat preservations, is reheated to 1130 ± 10 DEG C and is kept the temperature.
Further, homogenize process send steel ingot into soaking pit to be red, and its temperature is measured before steel ingot puts soaking pit into T, heating temperature and soaking time is spent to carry out according to following situations,
If 600 DEG C of 400 DEG C≤T <, makes steel ingot keep 1h under 600 DEG C of furnace temperature, then with≤100 first DEG C/Heating Steel Ingots to 850 ± 10 DEG C, make steel ingot keep 3h or more under 850 ± 10 DEG C of furnace temperature by the heating rate of h, Then with the heating rate of≤150 DEG C/h by Heating Steel Ingots to 1130 ± 10 DEG C, make furnace temperature of the steel ingot at 1130 ± 10 DEG C Lower holding 8h or more, total time of the steel ingot in soaking pit are 18~20h;
If 400 DEG C of T <, steel ingot is made to keep 5h under 600 DEG C of furnace temperature first, then with the liter of≤100 DEG C/h Heating Steel Ingots to 850 ± 10 DEG C, are made steel ingot keep 3h or more under 850 ± 10 DEG C of furnace temperature by warm rate, secondly with≤ Heating Steel Ingots to 1130 ± 10 DEG C, are made steel ingot keep 8h under 1130 ± 10 DEG C of furnace temperature by the heating rate of 150 DEG C/h More than, total time of the steel ingot in soaking pit be 22~for 24 hours;
Above-mentioned homogenize process strict control holding temperature and soaking time improve while improving eutectic carbide segregation The hot-workability of steel.It is verified through analysis of experiments, by heating and temperature control at 1130 ± 10 DEG C, net carbide is netted in steel At most, dissolution is most abundant for fusing, most beneficial for postorder process to being crushed for net carbide etc..
Wherein, forging or the operation of rolling are in different temperatures range restraint different distortion amount.
Wherein, forging process is using wide flat anvil forging up and down, and forging process according to different temperatures range restraint not Same pass deformation, when temperature is at 1070 DEG C or more, pass deformation is controlled between 5%~10%;When temperature is 1070 DEG C~900 DEG C between when, pass deformation control between 20%~35%;When temperature is at 900 DEG C or less, pass deformation Between 3%~5%, final forging temperature is not less than 860 DEG C for control, need when molding quickly, small deformation shaping, prevent chink.
Wherein, the operation of rolling carries out the rolling of six passage reversibles, and the control of the first passage rolling temperature is at 1070 DEG C or more, steel Ingot deforms reduction ratio control between 10%~15%, and pony-roughing pass rolling temperature controls the steel ingot between 1070 DEG C~970 DEG C Total deformation reduction ratio controls between 20%~30%, and final pass rolling temperature controls the steel ingot between 970 DEG C~900 DEG C Reduction ratio control is deformed between 3%~5%.
Different temperatures section corresponds to different pass deformations, and mainly consideration eutectic carbide is in the molten of different temperatures section Solution, fusing, thickness, size, distribution situation cooperate different passages to become in conjunction with steel grade in the plastic deformation ability of this temperature range Shape amount, make entirely to forge or the operation of rolling to the breaking capacity of netted eutectic carbide as far as possible greatly without regard to generate forging or The manufacturing deficiencies such as rolling crack.Selection forging or roll, mainly according to the requirement of target product, as specification size, Flaw detection rank, eutectic carbide rank etc., in conjunction with live actual production process control situation, comprehensive determining use is forged or is rolled Production.
Wherein, the biting speed in the first hole of rolling is 15~25r/min, and the biting speed of finished hole is not more than 10r/ min。
Wherein, before steel ingot is transported on milling train, check that steel ingot whether there is male and female face or black root, and if it exists, then by steel Ingot is re-released into soaking pit, and 1h or more is kept under 1130 ± 10 DEG C of furnace temperature, is then come out of the stove, this is in order to prevent Heating Steel Ingots unevenness causes the postorder operation of rolling implosion or face crack occur.
Wherein, milling train is reversible mill, thereon roller diameter be 760~870mm, bottom roll diameter be 770~ 880mm。
By the control of the different temperatures section different distortion amount in forging or rolling, crushing large particle carbide improves Eutectic carbide distribution, prevents crack defect in forging process, and being finally reached improves the irregularity of eutectic carbides rank, improves Lumber recovery reduces production cost, improves the purpose of product quality level.
Embodiment 1
Cold work die steel forging method of the invention is used to manufacture the trade mark as the cold work die steel of Cr12MoV, including Smelting step, homogenize process step and forging step, specific as follows:
Steel ingot is obtained by smelting step, the weight of the steel ingot is 3.35t slab ingot, steel ingot carbide C, The mass fraction (wt%) of Cr, Mo, V are respectively as follows: C:1.46, Cr:11.67, Mo:0.41, V:0.2;
Homogenize process step, red to send steel ingot into soaking pit, it is 495 DEG C that steel ingot, which is put into and measures its temperature before soaking pit, Steel ingot is set to keep 1h under 600 DEG C of furnace temperature, with the heating rate of 100 DEG C/h by Heating Steel Ingots to 850 ± 10 DEG C, and Keep the temperature 4h under the conditions of this temperature, secondly with the heating rate of 150 DEG C/h by Heating Steel Ingots to 1130 ± 10 DEG C, and in this temperature strip 10h is kept the temperature under part, finally steel ingot is made to come out of the stove, and total time of the steel ingot in soaking pit is 19.5h;
Step is forged, using the direct drawing out moulding process of a two light weights, is forged using wide flat anvil up and down, total forging ratio is 6.5, starting forging temperature is 1100 DEG C, and final forging temperature is 860 DEG C, according to forging process different temperatures section, when temperature is at 1070 DEG C When above, pass deformation is controlled between 8%~10%, when temperature is between 1070 DEG C~900 DEG C, pass deformation control System is between 25%~30%, and when temperature is at 900 DEG C or less, pass deformation is controlled between 3%~5%.
It is prepared through the above steps and forges material with a thickness of the Cr12MoV cold work die steel of 180mm, forging process does not occur Implosion and surface crack defect, finished product evaluate the irregularity of eutectic carbides rank by the 4th judge picture in GB/T14979 standard It is 3.5 grades, finished product presses GB/T6402 ultrasonic examination, and qualified rank is determined that credit rating meets B/b by GB/T1299-2014 Grade.
Embodiment 2
Cold work die steel milling method of the invention is used to manufacture the trade mark as the cold work die steel of Cr12MoV, including Smelting step, homogenize process step and milling step, specific as follows:
Steel ingot is obtained by smelting step, the weight of the steel ingot is 3.2t slab ingot, steel ingot carbide C, The mass fraction (wt%) of Cr, Mo, V are respectively as follows: C:1.48, Cr:11.54, Mo:0.43, V:0.22;
Homogenize process step, red to send steel ingot into soaking pit, it is 480 DEG C that steel ingot, which is put into and measures its temperature before soaking pit, Steel ingot is set to keep 1h under 600 DEG C of furnace temperature, with the heating rate of 100 DEG C/h by Heating Steel Ingots to 850 ± 10 DEG C, and Keep the temperature 4h under the conditions of this temperature, secondly with the heating rate of 150 DEG C/h by Heating Steel Ingots to 1130 ± 10 DEG C, and in this temperature strip 9h is kept the temperature under part, finally steel ingot is made to come out of the stove, and total time of the steel ingot in soaking pit is 18.5h;
Milling step, steel ingot checks after coming out of the stove does not find male and female face or black root, it is transported on milling train, is carried out continuously six The rolling of passage reversible, wherein the biting speed in the first hole is 18r/min, the biting speed of finished hole is 6r/min, first At 1100 DEG C~1070 DEG C, steel ingot deforms reduction ratio by 13% control, the control of pony-roughing pass rolling temperature for secondary rolling temperature control Between 1070 DEG C~990 DEG C, steel ingot deforms reduction ratio by 25% control, and final pass rolling temperature is controlled 990 DEG C~960 Between DEG C, steel ingot deforms reduction ratio by 5% control.
The Cr12MoV cold work die steel stocking with a thickness of 85mm is prepared through the above steps, the operation of rolling does not occur Implosion and surface crack defect, finished product evaluate the irregularity of eutectic carbides rank by the 4th judge picture in GB/T14979 standard It is 3 grades, finished product presses GB/T6402 ultrasonic examination, and qualified rank is determined that credit rating meets A/a grades by GB/T1299-2014.

Claims (10)

1. improve the preparation method of cold work die steel eutectic carbide, smelting, homogenize process and forging or rolling including steel, It is characterized by:
A, the smelting of steel uses electric furnace smelting+LF refining+VD vacuum refining, and it is C that chemical component, which is calculated in mass percent control: 1.45~1.70, Cr:11.00~12.50, Mo:0.40~0.60, V:0.15~0.30;
B, at 1130 DEG C ± 10 DEG C, soaking time is controlled in 8h or more the heating and temperature control of homogenize process;
C, the steel ingot obtained through step b homogenize process is forged or is rolled, forging process is straight using " a two light weights " Pulling moulding process is connect, the operation of rolling is that progress reversible rolling on milling train is transported to after steel ingot is come out of the stove.
2. the preparation method according to claim 1 for improving cold work die steel eutectic carbide, it is characterised in that: describedization Study point be calculated in mass percent control be C:1.45~1.57, Cr:11.00~11.75, Mo:0.40~0.50, V:0.15~ 0.22。
3. the preparation method according to claim 1 or 2 for improving cold work die steel eutectic carbide, it is characterised in that: institute State homogenize process be it is red send steel ingot into soaking pit, keep the temperature steel ingot under 600 ± 10 DEG C of furnace temperature, then plus Heat is kept the temperature to 850 ± 10 DEG C, is reheated to 1130 ± 10 DEG C and is kept the temperature.
4. described in any item preparation methods for improving cold work die steel eutectic carbide, feature exist according to claim 1~3 In: the homogenize process send steel ingot into soaking pit to be red, and its temperature T is measured before steel ingot puts soaking pit into, heating temperature Degree and soaking time are carried out according to following situations,
If 600 DEG C of 400 DEG C≤T <, makes steel ingot keep 1h under 600 ± 10 DEG C of furnace temperature, then with≤100 first DEG C/Heating Steel Ingots to 850 ± 10 DEG C, make steel ingot keep 3h or more under 850 ± 10 DEG C of furnace temperature by the heating rate of h, Then with the heating rate of≤150 DEG C/h by Heating Steel Ingots to 1130 ± 10 DEG C, make furnace temperature of the steel ingot at 1130 ± 10 DEG C Lower holding 8h or more, total time of the steel ingot in soaking pit are 18~20h;
If 400 DEG C of T <, steel ingot is made to keep 5h under 600 ± 10 DEG C of furnace temperature first, then with the liter of≤100 DEG C/h Heating Steel Ingots to 850 ± 10 DEG C, are made steel ingot keep 3h or more under 850 ± 10 DEG C of furnace temperature by warm rate, then with≤ Heating Steel Ingots to 1130 ± 10 DEG C, are made steel ingot keep 8h under 1130 ± 10 DEG C of furnace temperature by the heating rate of 150 DEG C/h More than, total time of the steel ingot in soaking pit be 22~for 24 hours.
5. the preparation method according to any one of claims 1 to 4 for improving cold work die steel eutectic carbide, feature exist In: the forging or the operation of rolling are in different temperatures range restraint different distortion amount.
6. described in any item preparation methods for improving cold work die steel eutectic carbide, feature exist according to claim 1~5 In: the forging process is using wide flat anvil forging up and down, and when steel ingot temperature is at 1070 DEG C or more, pass deformation control exists Between 5%~10%, when temperature is between 1070 DEG C~900 DEG C, pass deformation is controlled between 20%~35%, works as temperature At 900 DEG C or less, pass deformation controls between 3%~5% degree, and final forging temperature is not less than 860 DEG C.
7. described in any item preparation methods for improving cold work die steel eutectic carbide, feature exist according to claim 1~6 In: the operation of rolling carries out the rolling of six passage reversibles, and at 1070 DEG C or more, steel ingot deforms the control of the first passage rolling temperature Reduction ratio controls between 10%~15%, and pony-roughing pass rolling temperature controls the steel ingot total deformation between 1070 DEG C~970 DEG C Reduction ratio controls between 20%~30%, and final pass rolling temperature controls between 970 DEG C~900 DEG C, steel ingot deformation pressure Lower rate control is between 3%~5%.
8. described in any item preparation methods for improving cold work die steel eutectic carbide, feature exist according to claim 1~7 In: the biting speed in first hole of the operation of rolling is 15~25r/min, and the biting speed of finished hole is not more than 10r/min.
9. described in any item preparation methods for improving cold work die steel eutectic carbide, feature exist according to claim 1~8 In: the steel ingot before rolling, checks that steel ingot whether there is male and female face or black root, and if it exists, be then re-released into steel ingot In hot stove, and 1h or more is kept under 1130 ± 10 DEG C of furnace temperature, then come out of the stove.
10. described in any item preparation methods for improving cold work die steel eutectic carbide according to claim 1~9, feature Be: the milling train is reversible mill, and topping roll diameter is 760~870mm, and bottom roll diameter is 770~880mm.
CN201811001267.7A 2018-08-30 2018-08-30 Improve the preparation method of cold work die steel eutectic carbide Pending CN109055850A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110551880A (en) * 2019-10-24 2019-12-10 成都先进金属材料产业技术研究院有限公司 softening heat treatment process for small-size 22Si2MnCrNi2MoA steel rolled material
CN114015949A (en) * 2021-11-11 2022-02-08 成都先进金属材料产业技术研究院股份有限公司 Method for improving vanadium-containing cold-work die steel carbide form

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Application publication date: 20181221